(4) Investments

As of September 30, 2013, we held certain investments that are required to be measured for disclosure purposes at fair value on a recurring basis. These investments are considered Level 2 investments and are all considered to be held-to-maturity securities. We consider as current assets those investments which will mature in the next 12 months. The remaining investments are considered non-current assets. The amortized cost and fair value of our investments, and the related gross unrealized gains and losses, were as follows as of September 30, 2013 (in thousands):

			Gross Unrealized
	Cost		Gains		Losses		Fair Value
Short-term Investments:
Corporate bonds	$	8,448	$	142	$	--	$	8,590

Long-term Investments
Corporate bonds	$	20,104	$	426	$	--	$	20,530

At September 30, 2013, the length of time until maturity of these securities ranged from 7.5 months to 18.5 months.